sqlserver查询最大的SQL开销语句

--查询前20条
SELECT TOP 20 SUBSTRING(qt.text, (qs.statement_start_offset/2)+1, 

        ((CASE qs.statement_end_offset

          WHEN -1 THEN DATALENGTH(qt.text)

         ELSE qs.statement_end_offset

         END - qs.statement_start_offset)/2)+1), 

qs.execution_count, 

qs.total_logical_reads, qs.last_logical_reads,

qs.min_logical_reads, qs.max_logical_reads,

qs.total_elapsed_time, qs.last_elapsed_time,

qs.min_elapsed_time, qs.max_elapsed_time,

qs.last_execution_time,

qp.query_plan

FROM sys.dm_exec_query_stats qs

CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt


CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp

WHERE qt.encrypted=0

order by last_execution_time desc
--ORDER BY qs.total_logical_reads DESC